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    宋雅萍, 金玲, 管欣悦, 王朝锋, 李欣欣. pH响应油水分离共聚物膜的合成及分离应用[J]. 华东理工大学学报(自然科学版), 2020, 46(1): 16-23. DOI: 10.14135/j.cnki.1006-3080.20181214002
    引用本文: 宋雅萍, 金玲, 管欣悦, 王朝锋, 李欣欣. pH响应油水分离共聚物膜的合成及分离应用[J]. 华东理工大学学报(自然科学版), 2020, 46(1): 16-23. DOI: 10.14135/j.cnki.1006-3080.20181214002
    SONG Yaping, JIN Ling, GUAN Xinyue, WANG Chaofeng, LI Xinxin. Synthesis of pH-Responsive Polymer Film and Its Application for Oil/Water Separation[J]. Journal of East China University of Science and Technology, 2020, 46(1): 16-23. DOI: 10.14135/j.cnki.1006-3080.20181214002
    Citation: SONG Yaping, JIN Ling, GUAN Xinyue, WANG Chaofeng, LI Xinxin. Synthesis of pH-Responsive Polymer Film and Its Application for Oil/Water Separation[J]. Journal of East China University of Science and Technology, 2020, 46(1): 16-23. DOI: 10.14135/j.cnki.1006-3080.20181214002

    pH响应油水分离共聚物膜的合成及分离应用

    Synthesis of pH-Responsive Polymer Film and Its Application for Oil/Water Separation

    • 摘要: 以自由基聚合方法合成了聚(甲基丙烯酸二甲氨基乙酯-co-甲基丙烯酸羟乙酯-co-甲基丙烯酸十二烷基酯)(P(DMAEMA-co-HEMA-co-DMA)),通过浸渍法将聚合物、聚合物/SiO2涂覆在不锈钢网表面获得pH响应油水分离膜。采用扫描电子显微镜(SEM)、场发射扫描电子显微镜(FESEM)和接触角测量仪测试分析了聚合物涂覆不锈钢网的表面形貌和润湿性能;采用X射线光电子能谱仪(XPS)对表面元素进行了表征;红外测油仪测试膜的油水乳液分离能力。结果表明:经修饰的不锈钢网表面润湿性能随pH变化而改变,这与XPS的测试结果相符。油水分离实验表明,SiO2的加入会使材料的亲水疏油和亲油疏水性能大大提高,当其质量分数为3%时,通过红外测油仪测得分离前后乳液中的正己烷浓度变化,可知分离效率大于99%;动态光散射仪测定分离前后的乳液粒径,证明了分离效果。

       

      Abstract: The poly (dimethylaminoethyl methacrylate-co-hydroxyethyl methacrylate-co-dodecyl methacrylate, DMAEMA-co-HEMA-co-DMA) was synthesized by free radical polymerization. Then stainless steel meshes with different apertures were coated with the polymer or polymer/SiO2 through impregnation, leading to the pH-responsive oil-water-separation film. The topological structure and wettability of the meshes were analyzed by scanning electron microscope(SEM) and contact angle(CA) test, respectively. The distribution of elements was characterized by X-ray photoelectron spectroscopy(XPS). Furthermore, the oil/water separation capacity of the meshes was tested. The results demonstrated that the surfaces of the meshes turned to be smoother after the coating with the polymers, while they became very rough in case SiO2 was added into the coating. Besides, the surface wettability varied with pH, which was consistent with the XPS results. Under acidic condition, the coated surfaces were hydrophilic. However, as the media was neutral/slightly alkaline, the surface became hydrophobic. Such change was related to the binding states of nitrogen. The −N− in PDMAEMA was protonated under acidic condition so that the chain stretched and the hydrophilicity was increased. Furthermore, the addition of SiO2 made the mesh superhydrophilic under acidic condition and superhydrophobic under neutral/slightly alkaline condition, which could be ascribed to the enhancement of surface roughness. When the media was highly alkaline, the wettability of the surface was very unstable due to the chemical reaction of SiO2 under this condition. Oil/water separation experiments showed that the presence of SiO2 and polymer enabled the meshes with good capacity for the effective separation of oil and water, and additionally endowed the meshes with a good stability. Meanwhile, when the mass fraction of SiO2 was 3%, the results collected from infrared oil measurment showed that the meshes presented good separation capacity for oil-in-water emulsion, and the efficiency was more than 99%. Such results were further confirmed by DLS tests.

       

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